Flutter; Aeroelasticity; Unsteady Aerodynamics; Panel Methods; Finite Element Analysis
Abstract :
[en] The Source and Doublet Panel Method (SDPM) developed by Morino in the 1970s can model unsteady compressible ideal flow around wings and bodies. In this work, the SDPM is adapted to the calculation of aeroelastic solutions for wings. A second order nonlinear version of Bernoulli's equation is transformed to the frequency domain and written in terms of the generalized mode shapes and displacements. It is shown that the pressure component at the oscillating frequency is a linear function of the generalized displacements, velocities and accelerations and can therefore be used to formulate a linear flutter problem. The proposed approach has several advantages over the usual Doublet Lattice Method (DLM) approach: the exact geometry is modelled, including thickness, camber and twist effects, the motion of the surface can be represented using all six degrees of freedom, the pressure calculation is of higher order and the aerodynamic mass, damping and stiffness terms are calculated explicitly. The complete procedure is validated using the experimental data from the weakened AGARD 445.6 wing, a NACA 0012 rectangular wing with pitch and plunge degrees of freedom and an experimental model of a T-tail, yielding flutter predictions that lie closer to the experimental observations than those obtained from the DLM, particularly in the case of the T-tail.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Dimitriadis, Grigorios ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Kilimtzidis, Spiridon; University of Patras > Department of Mechanical Engineering & Aeronautics
Kostopoulos, Vassilis; University of Patras > Department of Mechanical Engineering & Aeronautics
Laraspata, Vito; Politecnico di Bari > Department of Mathematics, Mechanics and Management
Soria, Leonardo; Politecnico di Bari > Department of Mathematics, Mechanics and Management
Language :
English
Title :
Flutter calculations using the unsteady source and doublet panel method
Publication date :
January 2025
Journal title :
Journal of Aircraft
ISSN :
0021-8669
eISSN :
1533-3868
Publisher :
American Institute of Aeronautics and Astronautics, United States - Virginia
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